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Eighth Grade (Grade 8) Reactions Questions

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Grade 8 Reactions
Which of the following is an indicator of a chemical change or reaction?
  1. a solid dissolves
  2. a new substance is formed
  3. water turns to steam
  4. a mixture is made
Grade 8 Reactions
What law says that nothing can be created or destroyed in a reaction?
  1. The Law of Physics
  2. The Law of Conservation and Mass
  3. The Law of Chemistry
  4. The Law of Conserving Chemical Reactions
Grade 8 Reactions
When oxygen in the air reacts with iron, iron oxide forms. Which of the following statements is correct?
  1. This is a physical change.
  2. This is a chemical change.
  3. Iron and iron oxide have the same properties.
  4. Oxygen and iron have similar properties.
Grade 8 Reactions
Grade 8 Reactions
Which example shows a coefficient being used correctly to balance a chemical equation?
  1. [math]Na+Cl_2->2NaCl[/math]
  2. [math]Na+2Cl_2->2NaCl[/math]
  3. [math]2Na+Cl_2 ->2NaCl_2[/math]
  4. [math]2Na+Cl_2->2NaCl[/math]
Grade 8 Reactions
What information do you need to write a chemical equation?
  1. reactants
  2. products
  3. chemical formulas
  4. all of the above
Grade 8 Reactions
A substance that undergoes a change in a chemical reaction is
  1. a substance.
  2. a reactant.
  3. an enzyme.
  4. a chemical.
Grade 8 Reactions
The only sure evidence for a chemical reaction is
  1. the formation of a gas.
  2. production of one or more new substances.
  3. color change.
  4. changes in properties.
Grade 8 Reactions
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